Preheat oven to 400°.,Spray an 8-inch square baking pan with a nonstick coating.,Combine sugar, oats, nuts, oleo and flour. Mix until crumbly with fork.,Reserve 1 1/2 cups of crumbly mixture.,Spread the remainder in the bottom of the pan.,______,Sprinkle reserved crumb mixture over top.,Press gently into filling.,Bake for 20 to 25 minutes, until browned.,Good served warm with whipped topping.